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Table 2 The degrees of facet degeneration according to ages

From: Relationship between facet tropism and facet joint degeneration in the sub-axial cervical spine

  30–39 40–49 50–59 60–69 Total
Normal (%) 149 (87.65) 432 (88.16) 200 (71.43) 42 (70) 823 (82.3)
Degenerated (%) 21 (12.35) 58 (11.84) 80 (28.57) 18 (30) 177 (17.7)
Total (%) 170 (100) 490 (100) 280 (100) 60 (100) 1000 (100)